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The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the ELSE clause.
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CASE WHEN Quantity > 30 THEN 'The quantity is greater than...
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SQL Statement: SELECT CustomerName, City, Country FROM...
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13 cze 2021 · For SQL Server: CASE case-expression WHEN when-expression-1 THEN value-1 [ WHEN when-expression-n THEN value-n ... ] [ ELSE else-value ] END or: CASE WHEN boolean-when-expression-1 THEN value-1 [ WHEN boolean-when-expression-n THEN value-n ... ] [ ELSE else-value ] END expressions, etc:
3 wrz 2024 · The simple CASE expression compares an expression to a set of simple expressions to determine the result. The searched CASE expression evaluates a set of Boolean expressions to determine the result. Both formats support an optional ELSE argument. CASE can be used in any statement or clause that allows a valid expression.
16 sty 2024 · In the realm of SQL, the CASE WHEN statement functions much like an if-then-else expression, allowing us to create custom classifications within a query. Other programming languages use similar logic – e.g. Python uses if, elif, and else, and JavaScript uses the switch statement.
The CASE statement returns the result_1, result_2, or result_3 if the expression matches the corresponding expression in the WHEN clause. If the expression does not match any expression in the WHEN clause, it returns the esle_result in the ELSE clause. The ELSE clause is optional.
In this syntax, the CASE statement evaluates each WHEN condition in order, returning the corresponding result when a condition is true. If none of the conditions are true, the statement returns the result specified in the ELSE clause.
The ELSE clause is executed if none of the conditions in the CASE statement is matched. Syntax SELECT customer_id, first_name, CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 -- Add more WHEN conditions and results as needed ELSE else_result END AS alias_name FROM table_name;
